1231611151 has 2 divisors, whose sum is σ = 1231611152. Its totient is φ = 1231611150.

The previous prime is 1231611109. The next prime is 1231611169. The reversal of 1231611151 is 1511161321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231611151 - 2⁷ = 1231611023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231011151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615805575 + 615805576.

It is an arithmetic number, because the mean of its divisors is an integer number (615805576).

Almost surely, 2^1231611151 is an apocalyptic number.

1231611151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231611151 is an equidigital number, since it uses as much as digits as its factorization.

1231611151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 22.

The square root of 1231611151 is about 35094.3179304001. The cubic root of 1231611151 is about 1071.9088850006.

Adding to 1231611151 its reverse (1511161321), we get a palindrome (2742772472).

The spelling of 1231611151 in words is "one billion, two hundred thirty-one million, six hundred eleven thousand, one hundred fifty-one".